Quad9 DNS is being praised as a secure, private DNS service with ad-blocking capabilities, suitable for new users and those unfamiliar with such technologies. The service is Swiss-based, with no logging, tracking, or data selling, making it a privacy-focused option. Users are also highlighting its support for DNSSEC, DoH, DoT, QUIC, and malware blocking, which are underappreciated features for privacy and security.

The community is split on whether Quad9's features like ECS (Encrypted Client Hello) are necessary or beneficial. Some argue it adds security, while others claim it may be unwanted or unnecessary. Unitedwithme emphasized that Quad9 is a secure, private DNS service with ad-blocking capabilities, suitable for new users. They also noted that FOSS-based systems like Pihole, eBlocker, and AdGuard can utilize Quad9 for ad-blocking and DNS resolution.

The weight of opinion points to Quad9 being a secure and effective private DNS service with ad-blocking capabilities. However, there are clear fault lines over whether certain features like ECS are needed or not. The community consensus is that Quad9 is a privacy-focused option, but its features remain a point of contention.